# Emission estimation calculators, booklet 1: chapter 9

## Grain Elevator

The substances of concern released from the operation of grain elevators Criteria Air Contaminants (Part 4 Substances).

### Suggested estimation methodology: Emission Factor

The general equation for emissions estimation is:

E = A x EF

where:

• E = emissions
• A = activity rate
• EF = emission factor

#### Input Data

The activity rate (A) is the number of tonnes of grain processed. There are individual emission factors for Total Particulate Matter (TPM), Particulate matter with a diameter less than or equal to 10 micrometres (µm) (PM10) and Particulate matter with a diameter less than or equal to 2.5 micrometres (PM2.5) for each of the grain elevator processes. The total emissions for each substance will be the sum of the each of the emissions for each process.

#### Releases for Part 4 Substances

Total Particulate Matter (TPM) Footnote*
Process Emission Factor (EF)Footnote1 EF Units
Grain Drying - Column Dryer 0.11 kilograms (kg)/tonne
Grain Drying - Rack Dryer 1.5 kg/tonne
Grain Drying - Rack Dryer (Self-cleaning screens (< 50 mesh)) 0.235 kg/tonne
Headhouse & Internal Handling (legs, belts, distributors, scale, etc.) 0.0305 kg/tonne
Grain Cleaning - Internal Vibrating (Single Cyclone only)Footnote** 0.0375 kg/tonne
Storage Bin Vents 0.0125 kg/tonne
Particulate Matter less than or equal to 10 µm (PM 10) Footnote*
Process Emission Factor (EF)Footnote1 EF Units
Grain Drying - Column Dryer 0.0275 kg/tonne
Grain Drying - Rack Dryer 0.375 kg/tonne
Grain Drying - Rack Dryer (Self-cleaning screens (< 50 mesh)) 0.06 kg/tonne
Headhouse & Internal Handling (legs, belts, distributors, scale, etc.) 0.017 kg/tonne
Grain Cleaning - Internal Vibrating (Single Cyclone only)Footnote** 0.0095 kg/tonne
Storage Bin Vents 0.00315 kg/tonne
Particulate Matter less than or equal to 2.5 µm (PM 2.5) Footnote*
Process Emission Factor (EF)Footnote1 EF Units
Grain Drying - Column Dryer 0.0047 kg/tonne
Grain Drying - Rack Dryer 0.065 kg/tonne
Grain Drying - Rack Dryer (Self-cleaning screens (< 50 mesh)) 0.01 kg/tonne
Headhouse & Internal Handling (legs, belts, distributors, scale, etc.) 0.0029 kg/tonne
Grain Cleaning - Internal Vibrating (Single Cyclone only)Footnote** 0.0016 kg/tonne
Storage Bin Vents 0.00055 kg/tonne

### Note on Emissions Factors

The default emission factors are used in the table above, however if you have a site specific emission factor you would prefer to use you may enter it in the emission factor column. If you choose to insert your own emission factor ensure that the units have been converted accordingly.

Except where indicated, the emission factors used in this spreadsheet are based on uncontrolled emissions. If you are using an emission control device you will have to adjust the emissions calculated by this spreadsheet according to the following formula:

Controlled Emissions = Uncontrolled emission x ((100 - control efficiency)/100)